<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <script>
        // 交换两个变量
        let left = '苹果';
        let right = '橘子';

        let table;
        table = left;
        left = right;
        right = table;
        console.log(left,right);  //橘子 苹果
    </script>
</body>
</html>